Horizontal axis wind turbine apparatus
AssigneeFuji Jukogyo Kabushiki Kaisha
InventorShigeo Yoshida
Life of this patent
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Abstract
The object of the invention is to provide a control apparatus C of a horizontal axis wind turbine apparatus WTG that calculates the value en of a pitch angle command for each blade based on the rate of change ΨD of the azimuth angle Ψ of a Nacelle N and the rotor azimuth angle φ of the blades B1, B2 and B3, causes the rotor to generate torque around the yaw axis by periodically controlling the angle change of the pitch angle of the blades, and using that torque, controls the rate of change of the azimuth angle of the nacelle. The value of that angle change is calculated as a value that increases as the inputted value of the rate of change ΨD increases.
Claims3
A horizontal axis wind turbine apparatus comprising:
- a main turbine unit supporting a horizontal axis turbine rotatably around a horizontal axis, wherein the horizontal axis turbine has a plurality of blades and rotates around the horizontal axis by receiving wind;
- a tower supporting the main turbine unit pivotably in the horizontal direction, and allowing the main turbine unit to pivot in accordance with a direction of wind received by the blades;
- a pivoting position detector provided either on the main turbine unit side or on the tower side, for detecting a position of the main turbine unit in its pivoting direction;
- a blade rotation angle detector provided on the main turbine unit, for detecting a rotation angle of each of the blades in the rotational direction of the horizontal axis turbine;
- a blade pitch angle changing mechanism provided on the main turbine unit, for changing a pitch angle of each of the blades independently in a direction that increases the pitch angle or in a direction that decreases the pitch angle;
- and
- a pitch angle controller for controlling the blade pitch angle changing mechanism, based on the position of the main turbine unit in the pivoting direction detected by the pivoting position detector and the rotation angle of each blade detected by the blade rotation angle detector, so as to continuously adjust the pitch angle of each blade while the horizontal axis turbine is rotating;
- wherein the pitch angle of each blade is adjusted according to the rotation angle of each blade so that the pitch angle is greater when a horizontal component of a velocity vector of the blade is in a direction opposite to the pivoting direction of the main turbine unit than when the horizontal component of the velocity vector of the blade is in the same direction with the pivoting direction of the main turbine unit.
Dependencies are inferred from the claim text.